Exterior Ballistics- Is Something Missing?

Is there something missing in our exterior ballistic formula? Example: a 30 caliber 190 gr Sierra MK w/ a BC of .533, w/ a muzzle velocity of 3200 fps has a wind drift of 67.45" in a 10 mph crosswind @ 1000 yds. A 6mm 107 gr Sierra MK w/ approx the same BC .527, w/ the same muzzle velocity and the same remaining velocity, also has the same wind drift @ 1000 yds (68.73") w/ a 10 mph crosswind. It seems that in 6.5mm, 7mm, 30, and 338 this is accurate, but if you were in a shoot-off @ 1000 yd competition and you had your 30 cal (w/ above load) and your 6mm (w/ above load) both rifles being equal in the accuracy department and the wind started to pick up heavy (crosswind) which rifle would you use? Most people I know would use the 30.

Join Our FREE Newsletter!

About us

My family and I welcome you. I started LRH back in 2001 to provide a friendly place where like-minded individuals could share information and ideas to help take their long range shooting and hunting to the next level. We work hard to provide an enjoyable place to spend your time.

-Len, Andy, Chris and Kathy Backus-

Site Functions

Useful Links

Advertise Your Business

LRH is the website of choice for many of the sharpest minds in modern shooting and hunting. We have a high renewal rate among our Advertising Sponsors indicating that they feel the advertising is effective. They recognize our over 100,000 members as serious buyers who help set trends.